<template>

    <div class="wg-cap-wrap" :style="{width: width}">
      <div class="wg-cap-wrap__header">
        <span>请在下图<em>依次</em>点击：</span>
        <img class="wg-cap-wrap__thumb" v-if="thumbBase64Code" :src="thumbBase64Code" alt=" ">
      </div>
      <div class="wg-cap-wrap__body">
        <img class="wg-cap-wrap__picture" v-if="imageBase64Code" :src="imageBase64Code" alt=" " @click="handleClickPos($event)">
        <img class="wg-cap-wrap__loading" src="" alt="正在加载中...">
        <div v-for="(dot, key) in dots" :key="key" class="wg-cap-wrap__dot" :style="`top: ${dot.y}px; left:${dot.x}px;`">
          <span>{{ dot.index }}</span>
        </div>
      </div>
      <div class="wg-cap-wrap__footer">
        <div class="wg-cap-wrap__ico">
          <img @click="handleCloseEvent"
               src=""
               alt="关闭">
          <img @click="handleRefreshEvent"
               src=""
               alt="刷新">
        </div>
        <div class="wg-cap-wrap__btn">
          <button @click="handleConfirmEvent">确认</button>
        </div>
      </div>
    </div>

</template>

<script>
  export default {
    name: 'CaptchaPlus',
    mounted() {
      this.$emit('refresh')
    },
    props: {
      value: Boolean,
      width: {
        type: String,
        default: '300px'
      },
      calcPosType: {
        type: String,
        default: 'dom',
        validator: value => ['dom', 'screen'].includes(value)
      },
      maxDot: {
        type: Number,
        default: 5
        // validator: value => value > 10
      },
      imageBase64: String,
      thumbBase64: String
    },
    data() {
      return {
        dots: [],
        imageBase64Code: '',
        thumbBase64Code: ''
      }
    },
    watch: {
      value() {
        this.dots = []
        this.imageBase64Code = ''
        this.thumbBase64Code = ''
      },
      imageBase64(val) {
        this.dots = []
        this.imageBase64Code = val
      },
      thumbBase64(val) {
        this.dots = []
        this.thumbBase64Code = val
      }
    },
    methods: {
      /**
       * @Description: 处理关闭事件
       */
      handleCloseEvent() {
        this.$emit('close')
        // this.dots = []
        // this.imageBase64Code = ''
        // this.thumbBase64Code = ''
      },
      /**
       * @Description: 处理刷新事件
       */
      handleRefreshEvent() {
        this.dots = []
        this.$emit('refresh')
      },
      /**
       * @Description: 处理确认事件
       */
      handleConfirmEvent() {
        this.$emit('confirm', this.dots)
      },
      /**
       * @Description: 处理dot
       * @param ev
       */
      handleClickPos(ev) {
        if (this.dots.length >= this.maxDot) {
          return
        }
        const e = ev || window.event
        e.preventDefault()
        const dom = e.currentTarget

        const {domX, domY} = this.getDomXY(dom)
        // ===============================================
        // @notice 如 getDomXY 不准确可尝试使用 calcLocationLeft 或 calcLocationTop
        // const domX = this.calcLocationLeft(dom)
        // const domY = this.calcLocationTop(dom)
        // ===============================================
        let mouseX = (navigator.vendor === 'Netscape') ? e.pageX : e.x + document.body.offsetTop
        let mouseY = (navigator.vendor === 'Netscape') ? e.pageY : e.y + document.body.offsetTop

        if (this.calcPosType === 'screen') {
          mouseX = (navigator.vendor === 'Netscape') ? e.clientX : e.x
          mouseY = (navigator.vendor === 'Netscape') ? e.clientY : e.y
        }

        // 计算点击的相对位置
        const xPos = mouseX - domX
        const yPos = mouseY - domY

        // 转整形
        const xp = parseInt(xPos.toString())
        const yp = parseInt(yPos.toString())

        // 减去点的一半
        this.dots.push({
          x: xp - 11,
          y: yp - 11,
          index: this.dots.length + 1
        })
        return false
      },
      /**
       * @Description: 找到元素的屏幕位置
       * @param el
       */
      calcLocationLeft(el) {
        let tmp = el.offsetLeft
        let val = el.offsetParent
        while (val != null) {
          tmp += val.offsetLeft
          val = val.offsetParent
        }
        return tmp
      },
      /**
       * @Description: 找到元素的屏幕位置
       * @param el
       */
      calcLocationTop(el) {
        let tmp = el.offsetTop
        let val = el.offsetParent
        while (val != null) {
          tmp += val.offsetTop
          val = val.offsetParent
        }
        return tmp
      },
      /**
       * @Description: 找到元素的屏幕位置
       * @param dom
       */
      getDomXY(dom){
        let x = 0
        let y = 0
        if (dom.getBoundingClientRect) {
          let box = dom.getBoundingClientRect();
          let D = document.documentElement;
          x = box.left + Math.max(D.scrollLeft, document.body.scrollLeft) - D.clientLeft;
          y = box.top + Math.max(D.scrollTop, document.body.scrollTop) - D.clientTop
        }
        else{
          while (dom !== document.body) {
            x += dom.offsetLeft
            y += dom.offsetTop
            dom = dom.offsetParent
          }
        }
        return {
          domX: x,
          domY: y
        }
      }
    }
  }
</script>

<style>
  .wg-cap-wrap{
    background: #ffffff;

    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;

    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }
  .wg-cap-wrap__header{
    height: 50px;
    width: 100%;
    font-size: 15px;

    display:-webkit-box;
    display:-webkit-flex;
    display:-ms-flexbox;
    display:flex;
    -webkit-box-align:center;
    -webkit-align-items:center;
    -ms-flex-align:center;
    align-items: center;
  }
  .wg-cap-wrap__header span{
    padding-right: 5px;
  }
  .wg-cap-wrap__header span em{
    padding: 0 3px;
    font-weight: bold;
    color: #3e7cff;
    font-style: normal;
  }
  .wg-cap-wrap__header .wg-cap-wrap__image{
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    overflow: hidden;
    text-align: center;
    line-height: 1;
  }
  .wg-cap-wrap__header .wg-cap-wrap__thumb{
    min-width: 150px;
    text-align: center;
    line-height: 1;
    max-height: 100%;
  }
  .wg-cap-wrap__header .wg-cap-wrap__thumb.wg-cap-wrap__hidden{
    display: none;
  }

  .wg-cap-wrap__body{
    position: relative;
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    background: #34383e;
    margin: auto;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    overflow: hidden;
  }
  .wg-cap-wrap__body .wg-cap-wrap__picture{
    position: relative;
    z-index: 10;
    width: 100%;

    /*height: 100%;*/
    /*max-width: 100%;*/
    /*max-height: 100%;*/
    /*object-fit: cover;*/
    /*text-align: center;*/
  }
  .wg-cap-wrap__body .wg-cap-wrap__picture.wg-cap-wrap__hidden{
    display: none;
  }
  .wg-cap-wrap__body .wg-cap-wrap__loading{
    position: absolute;
    z-index: 9;
    top: 50%;
    left: 50%;
    width: 68px;
    height: 68px;
    margin-left: -34px;
    margin-top: -34px;
    line-height: 68px;
    text-align: center;
  }
  .wg-cap-wrap__body .wg-cap-wrap__dot{
    position: absolute;
    z-index: 10;
    width: 22px;
    height: 22px;
    color: #cedffe;
    background: #3e7cff;
    border: 2px solid #f7f9fb;
    line-height: 20px;
    text-align: center;
    -webkit-border-radius: 22px;
    -moz-border-radius: 22px;
    border-radius: 22px;
    cursor: default;
  }

  .wg-cap-wrap__footer {
    width: 100%;
    height: 40px;
    color: #34383e;
    display:-webkit-box;
    display:-webkit-flex;
    display:-ms-flexbox;
    display:flex;
    -webkit-box-align:center;
    -webkit-align-items:center;
    -ms-flex-align:center;
    align-items: center;
    padding-top: 15px;
  }
  .wg-cap-wrap__footer .wg-cap-wrap__ico{
    flex: 1;
  }
  .wg-cap-wrap__footer .wg-cap-wrap__ico img{
    width: 24px;
    height: 24px;
    color: #34383e;
    margin: 0 5px;
    cursor: pointer;
  }
  .wg-cap-wrap__footer .wg-cap-wrap__btn{
    width: 120px;
    height: 40px;
  }
  .wg-cap-wrap__footer .wg-cap-wrap__btn button{
    width: 100%;
    height: 40px;
    letter-spacing: 2px;
    text-align: center;
    padding: 9px 15px;
    font-size: 15px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    color: #fff;
    background-color: #409eff;
    border: 1px solid #409eff;
    -webkit-appearance: none;
    box-sizing: border-box;
    outline: none;
    margin: 0;
    transition: .1s;
    font-weight: 500;
    -moz-user-select: none;
    -webkit-user-select: none;
  }
  .wg-cap-wrap__footer .wg-cap-wrap__btn button:hover {
    background: #66b1ff;
    border-color: #66b1ff;
    color: #fff;
  }
</style>
